[Bug rtl-optimization/63259] Detecting byteswap sequence

[thopre01 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63259

--- Comment #5 from thopre01 at gcc dot gnu.org ---
Author: thopre01
Date: Fri Oct 31 11:55:07 2014
New Revision: 216971

URL: https://gcc.gnu.org/viewcvs?rev=216971&root=gcc&view=rev
Log:
2014-10-31  Thomas Preud'homme  <thomas.preudho...@arm.com>

    gcc/
    PR tree-optimization/63259
    * tree-ssa-math-opts.c (bswap_replace): Replace expression by a
    rotation left if it is a 16 bit byte swap.
    (pass_optimize_bswap::execute): Also consider bswap in LROTATE_EXPR
    and RROTATE_EXPR statements if it is a byte rotation.

    gcc/testsuite/
    PR tree-optimization/63259
    * optimize-bswapsi-1.c (swap32_f): New bswap pass test.
    * optimize-bswaphi-1.c: Drop useless SIType definition and fix typo in
    following comment.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/optimize-bswaphi-1.c
    trunk/gcc/testsuite/gcc.dg/optimize-bswapsi-1.c
    trunk/gcc/tree-ssa-math-opts.c